SQL problems. Please help

Use Priemiere Products database to complete the following exercise.

9. Use a subquery to find the rep number, last name, and first name of each sales rep who represents

at least one customer with a credit limit of $10,000. List each sales rep only once

in the results.

10. Repeat Exercise 9, but this time do not use a subquery.

11. Find the number and name of each customer that currently has an order on file for a

Gas Range.

12. List the part number, part description, and item class for each pair of parts that are in the

same item class. (For example, one such pair would be part AT94 and part FD21, because

the item class for both parts is HW.)

13. List the order number and order date for each order placed by the customer named

Johnson